Hi, I posted earlier about thickness data from freesurfer that I was interpolating to standard mesh. To do this, I used the following command:

SurfToSurf -i_fs MapIco_lh_std.white.asc -i_fs lh.white.asc -data lh.thickness.asc -prefix lh.thick_std

That command worked fine as far as I can tell, but I've been running into problems when I try smoothing the thickness data. I'm using the following command:

SurfSmooth -spec MapIco_lh_std.spec -surf_A MapIco_lh_std.smoothwm.asc -met LB_FEM-input lh.thick_std.1D -Niter 100 -fwhm 8 -add_index -output lh.thick_smooth.1D.dset

Smooth.jpg shows the results of a subject done this way, which seems to have weird artifacts that weren't there prior to smoothing. This also happened when I tried using white instead of smoothwm. However, when I ran equivalent commands in the opposite order (smoothed and then interpolated, smooth_before.jpg), everything looks fine.

I was wondering if this was an issue you'd seen before, and if there were options I could change on SurfSmooth that would produce better results. I'm hoping this doesn't simply mean that smoothing in standard mesh is a bad idea, since the SurfToSurf command takes a lot of processing time per subject.

Thanks,

-Aaron-